Angie tries to clear her lover's name while Harris works equally hard to convict him as the serial killer. Convinced Sean Hunter is innocent of the attack on Sophie, Angie sets out to exonerate the man she loves and catch the real killer.

Harris's obsession with Angie's new partner spirals out of control when one of the undercover unit falls victim to the serial killer.

After partying all night to celebrate passing her Constable exams, Chris is involved in a car accident which leaves a young boy permanently disabled.

An investigation of an illegal brothel that trades in sex slaves leads undercover to the case of a missing girl. She was kidnapped three years ago at the age of 15 and is presumed dead, but her mother knows she is alive.

Angie goes undercover as the long-lost daughter of contract killer William Franks. A notorious assassin, Franks hasn't seen his daughter since she was a three years old when he was imprisoned for the murder of his wife.

Undercover works with Task Force Domino to investigate a rash of gangland killings over drug territory. Detective Buzz Rutherford works with Undercover as the task force Liaison Officer.

When Church misbehaves on a drug bust and is accused of corruption by an unnamed informant, he is investigated by Internal Affairs. The Undercover team unearth evidence that an IA cop is framing Church.

While on a deep cover operation, Church is intercepted by a couple of thugs and thrown off a building. Waking in hospital with minor fractures and head trauma, Church discovers his memory has been completely wiped.

Chris convinces a young prostitute to give her information about a blackmail scam at a brothel. The client she names refuses to talk, and the prostitute is later found with her tongue cut out.

Church has established himself as the muscle in a close-knit Italian crime family, prolific producers of meth. When the head of the family discovers that his son has been seen in the company of a cop, he takes the cop hostage.

When Harris and Masters locate a massive quantity of cocaine in the boot on an imported Mustang, it looks like they're on the verge of a huge arrest.

An investigation of a liquor store robbery takes an unexpected turn when one of the gang members claim they are being protected by the Walrus, a corrupt cop.

Chris discovers a heart of darkness when she searches for the murderer of an old friend. As she becomes entwined in the lives of the boy's mates, she finds out the truth is more shocking than she imagined.

Angie arrives home late one night to find her sister Sam, dying of a massive stab wound. Why she has been murdered in such a terrible way is a total mystery.

When a third young woman goes missing from a popular Fitzroy Hotel, Homicide fears a serial killer is on the loose and call in Undercover for help.

Church and Gray fake the death of crime-boss Donald Wylie's wife in order to nab him on conspiracy charges.

While investigating a major coke ring, Church is stunned to learn that his primary target Ethan Stein, is married to his old flame Anna Trukan.

After the murders of three homeless men, Church goes undercover into the homeless community to track down the killer.

His addiction to opium rapidly taking hold, Luke Harris is heading into extremely dangerous territory and Church is about to uncover his boss's dark secret.

Harris plays it close to the bone when he goes undercover in a psychiatric clinic as a patient. Inside, he targets Evelyn Ballantyne the unstable sister of a murder victim.

Chris goes undercover with a gang of teenage burglars. But what should have been a simple case gets suddenly complicated when one of the gang, Slug, turns up dead.

Angie has convinced Veronica Taylor to turn Crown witness against her drug dealing husband.

Church goes undercover in an attempt to recover historical artifacts looted from a Baghdad museum during the recent war.

Church risks radiation exposure in a desperate attempt to avert the detonation of a dirty bomb.

Harris goes undercover as a translator for a Malaysian drug cartel and descends into a world of opium smoking and prostitution.

Angie and Harris face every parent's nightmare when their seven month old son Josh falls victim to a child abduction ring

Harris devises a novel plan to nab a high-profile gangster named Craig Levine that involves operative Chris going undercover into the world of female boxing.

Flynn's old flame guides him deep into the world of body art, heroin and murder.